Armed robbers gunned down a Hindu trader and his son upon resistance during a robbery attempt here on Saturday. The Hindu community held protest demonstration against the incident. Police said that armed robbers tried to loot a Hindu trader J. Paul Das and his son Grash Nath Aadani near DG Khan Cement Factory in industrial city Hub of district Lasbela. Upon resistance the robbers gunned down both and fled the scene after committing dual murder.